AU2008256573B2 - Tracking waveform selection for multifunction radar - Google Patents
Tracking waveform selection for multifunction radar Download PDFInfo
- Publication number
- AU2008256573B2 AU2008256573B2 AU2008256573A AU2008256573A AU2008256573B2 AU 2008256573 B2 AU2008256573 B2 AU 2008256573B2 AU 2008256573 A AU2008256573 A AU 2008256573A AU 2008256573 A AU2008256573 A AU 2008256573A AU 2008256573 B2 AU2008256573 B2 AU 2008256573B2
- Authority
- AU
- Australia
- Prior art keywords
- tracking
- tracking waveform
- radar
- target range
- range rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/66—Radar-tracking systems; Analogous systems
- G01S13/72—Radar-tracking systems; Analogous systems for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar
- G01S13/723—Radar-tracking systems; Analogous systems for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar by using numerical data
- G01S13/726—Multiple target tracking
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/295—Means for transforming co-ordinates or for evaluating data, e.g. using computers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S2013/0236—Special technical features
- G01S2013/0272—Multifunction radar
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to tracking waveforms in radar. More specifically, the present invention relates to minimising the dwell time and energy in a tracking waveform whilst maintaining a specified track positional accuracy and consequently velocity accuracy. The present invention provides a method and apparatus for selecting a tracking waveform in a radar apparatus comprising the steps of: determining a target range rate; determining a signal strength; determining the radiated frequency of the subsequent transmitted tracking waveform; and modifying the energy and pulse repetition frequency used on subsequent tracking waveforms on the basis of the determined target range rate, signal strength and next transmitted tracking waveform frequency.
Description
- 1 TRACKING WAVEFORM SELECTION FOR MULTI-FUNCTION RADAR The present invention relates to tracking waveforms in radar. More specifically, embodiments of the present invention relates to minimising the 5 dwell time and energy in a tracking waveform whilst maintaining a specified track positional accuracy and consequently velocity accuracy. In known radar apparatus, a fixed amount of time and energy is used for tracking waveforms, the settings for which are hard-coded in the radar apparatus. Thus, the track accuracy would vary according to the situation and 10 there would be no opportunity to optimise the tracking waveforms. Embodiments of the invention provide a method and apparatus for selecting a tracking waveform in a radar apparatus comprising the steps of: (i) determining a target range rate; (ii) determining a signal strength; (iii) determining the radiated frequency of the subsequent transmitted tracking 15 waveform; and (iv) modifying the energy and pulse repetition frequency used on subsequent tracking waveforms on the basis of the determined target range rate, signal strength and next transmitted tracking waveform frequency. Embodiments of the invention thus provide a means by which the time and energy resources of the radar can be managed to provide a required level 20 of performance. An advantage of embodiments of the present invention is that the amount of time and amount of energy in a tracking waveform can be adjusted according to the situation, in a self-reinforcing manner, to maximise the coherent gain on the target return and to minimise the radar time spent tracking 25 each target. Specific embodiments of the invention will now be described, by way of example only and with reference to the accompanying drawings that have like reference numerals, wherein: Figure 1 is a diagram showing the arrangement of components in a radar 30 apparatus according to an embodiment of the present invention; 3068014_1 (GHMaters) P82605.AU 1010112012 -2 Figure 2 is a diagram providing more detail of the Tracking Waveform Selection software module of the Radar Control software module; and Figure 3 is a graph showing the target coherent gain versus pulse repetition frequency that the embodiment of the present invention is operable to 5 achieve. The specific embodiment will now be described with reference to Figures 1 to 3: In Figure 1, there is shown a diagram of the hardware and software elements of the radar apparatus of the embodiment. The hardware elements 20 10 of the radar apparatus 10 are a phased array antenna 100 and a receiver 110. The antenna 100 is connected to the receiver 110. The remaining elements of the radar apparatus as shown in Figure 1 are embodied in software. Specifically, the receiver 110 is connected to a signal processing function 120, which is in turn connected to a tracking function 130, 15 again and in turn connected to a radar control function 150. A subset function of the radar control function 150 is the tracking waveform selection function 140, the functions and operation of which will be described in more detail below with reference to Figure 2. The radar control function is then connected to an interface function 160, which in turn is connected to the antenna 100 and 20 receiver 110. The tracking waveform selection function 140 is shown in more detail in Figure 2. The inputs to the tracking waveform selection function 140 are the signal to noise ratio for each track (fed through the tracking function 130 and radar control function 150 from the signal processing function 120), the range 25 rate estimate for each track (estimated by the tracking function 130 and fed through the radar control function 150) and the transmitted frequencies to be used (known and provided by the radar control 150). The range rate is the rate of change of slant range with time (measured, for example, in metres per second). Slant range is the distance between the radar and the target measured 30 along the straight line that directly connects them in three dimensions. Accordingly, target range rate is the range rate of a target measured at the observing radar. 3065014_1 (GHMatter) P82608 AL 10/0112012 -3 In an embodiment of the invention, the signal to noise ratio for each track is normalised to a fixed pulse length and fixed target range and alpha smoothed before being input into the tracking waveform selection function 140. The tracking waveform selection function 140 performs two self 5 reinforcing steps: 1. With the alpha smoothed estimate of signal to noise ratio the total energy content (pulse length and number of pulses) of track waveforms is chosen for the expected target range and so as to achieve the required positional track accuracy 10 2. With the estimate of the target range rate and its associated error (also output by the tracking function 130), the pulse repetition frequency on track update waveforms which use coherent processing is chosen to maximise the coherent gain on the target return. This acts to reinforce the determination of total energy 15 content since achieving processing gain through a coherent filter will subsequently reduce the total energy requirement. The tracking waveform selection function 140 then outputs the pulse length, number of coherent bursts and the pulse repetition frequency to be used in the next tracking waveform. This is passed through the radar control 150, via 20 the interface 160, to the antenna 100 and receiver 110. The graph in Figure 3 shows the target areas of the graph that the embodiment is operable to arrange, illustrated by box 300, the dimensions of which are given Doppler frequencies at which the coherent gain is above unity gain. If the returned signals exhibit a coherent gain above unity gain, then an 25 increased signal to noise ratio is exhibited to enable tracking of the target. Embodiments of the invention acts to enable a suitable signal to noise ratio for returned signals whilst using the minimum radar time. In this way the invention acts to control both the time and energy of radar tracking waveforms in order to minimise the use of radar resources whilst 30 achieving a required level of track position and velocity accuracy. 3068014_1 (GHMalters) P82608AU 10/01/2012 -4 The skilled person reading the above embodiment of the invention will understand that, although the embodiment describes the use of a phased array antenna, the above invention is applicable to any multi-function radar apparatus. 5 It is to be understood that any feature described in relation to any one embodiment may be used alone, or in combination with other features described, and may also be used in combination with one or more features of any other of the embodiments, or any combination of any other of the embodiments. Furthermore, equivalents and modifications not described above 10 may also be employed without departing from the scope of the invention, which is defined in the accompanying claims. It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other 15 country. In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the 20 stated features but not to preclude the presence or addition of further features in various embodiments of the invention. 3066014_1 (GHMatterS) P82608.AU 10/012012
Claims (8)
1. A method for selecting a tracking waveform in a radar apparatus for tracking one or more targets, the method comprising the steps of: 5 For at least one track, using a transmitted tracking waveform having an energy and pulse repetition frequency to determine a target range rate and i) a returned signal strength for a target; ii) determining the radiated frequency of a subsequent transmitted tracking waveform for the at least one track; and 10 iii) modifying the energy and pulse repetition frequency for use on the subsequent tracking waveform for the at least one track on the basis of the determined target range rate, return signal strength and radiated frequency.
2. A method according to claim 1, using coherent return signal processing, 15 wherein the pulse repetition frequency of the subsequent tracking waveform is chosen to maximise the coherent gain on the returned signal for the target.
3. A method according to claim 1 or claim 2, wherein the target range rate comprises an estimated target range rate and an associated error. 20
4. A method according to any one of claims 1 to 3 wherein the returned signal strength comprises a signal to noise ratio.
5. A method according to claim 4, wherein the signal to noise ratio is alpha smoothed.
6. A radar apparatus for tracking one or more targets, the apparatus 25 comprising a signal processing function, a tracking function and a radar control function, the apparatus being operable to use a transmitted tracking waveform having an energy and pulse repetition frequency to determine a target range rate and a returned signal strength for at least one track, 3088014_1 (GHMalters) P82608.AU 10101/2012 -6 Characterised in that the radar control function comprises a tracking waveform selection function operable to modify the energy and pulse repetition frequency for use on a subsequent tracking waveform for the at least one track on the basis of the determined target range rate and 5 returned signal strength of the transmitted tracking waveform, and the radiated frequency of the subsequent tracking waveform, the apparatus being operable to carry out the method of any one of claims 1 to 5.
7. A method as claimed in any one of claims 1 to 5, and substantially herein described with reference to Figures 1 to 3. 10
8. An apparatus as claimed in claim 6, and substantially herein described with reference to Figures 1 to 3. 3068014_1 (GHMatters) P82608.AU 10/01/2012
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0710370A GB0710370D0 (en) | 2007-06-01 | 2007-06-01 | Tracking waveform selection for multi-function radar |
EP07270027.1 | 2007-06-01 | ||
GB0710370.8 | 2007-06-01 | ||
EP07270027 | 2007-06-01 | ||
PCT/GB2008/050389 WO2008146046A1 (en) | 2007-06-01 | 2008-05-29 | Tracking waveform selection for multifunction radar |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2008256573A1 AU2008256573A1 (en) | 2008-12-04 |
AU2008256573B2 true AU2008256573B2 (en) | 2012-02-23 |
Family
ID=39735258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2008256573A Ceased AU2008256573B2 (en) | 2007-06-01 | 2008-05-29 | Tracking waveform selection for multifunction radar |
Country Status (5)
Country | Link |
---|---|
US (1) | US7852261B2 (en) |
EP (1) | EP2153244B1 (en) |
AU (1) | AU2008256573B2 (en) |
ES (1) | ES2468566T3 (en) |
WO (1) | WO2008146046A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8907838B1 (en) * | 2011-09-28 | 2014-12-09 | Rockwell Collins, Inc. | Radar aided doppler compensation |
RU2488136C1 (en) * | 2011-12-01 | 2013-07-20 | Открытое акционерное общество "НИИ измерительных приборов - Новосибирский завод имени Коминтерна" (ОАО "НПО НИИИП-НЗиК") | Method of tracking target path |
US10333421B2 (en) | 2017-03-30 | 2019-06-25 | Raytheon Company | Polymorphic waveform generation |
CN109581308A (en) * | 2018-11-28 | 2019-04-05 | 北京遥感设备研究所 | A kind of signal generating system and method for radar target tracking functional test |
CN110673131B (en) * | 2019-11-25 | 2022-04-26 | 电子科技大学 | Multi-beam centralized MIMO radar space-time resource-waveform selection management method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5245347A (en) * | 1980-12-29 | 1993-09-14 | Raytheon Company | All weather tactical strike system (AWTSS) and method of operation |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4143373A (en) | 1977-09-21 | 1979-03-06 | Hughes Aircraft Company | Adaptive radar systems and methods therefor |
US4649390A (en) * | 1983-08-05 | 1987-03-10 | Hughes Aircraft Company | Two dimension radar system with selectable three dimension target data extraction |
FR2729764B1 (en) * | 1986-09-16 | 1997-04-11 | Thomson Csf | IMPORTANT INSTANTANEOUS ANGULAR FIELD RADAR AND HIGH INSTANTANEOUS ANGULAR RESOLUTION POWER, ESPECIALLY FOR MISSILE SELF-DIRECTOR |
DE3926216A1 (en) | 1989-08-08 | 1991-02-14 | Siemens Ag | Multi-function radar with electronic phase-controlled antenna |
US5115246A (en) * | 1991-02-27 | 1992-05-19 | The United States Of America As Represented By The Secretary Of The Air Force | Radar target locating and tracking apparatus using a dual-interleaved pulse train radar waveform |
US5726657A (en) * | 1996-03-22 | 1998-03-10 | Lockheed Martin Corporation | Phase coherent radar system using fast frequency agile waveform synthesis |
CA2526133C (en) * | 2003-05-22 | 2012-04-10 | General Atomics | Ultra-wideband radar system using sub-band coded pulses |
US7046190B2 (en) * | 2003-07-25 | 2006-05-16 | Raytheon Company | Process for phase-derived range measurements |
US7626536B1 (en) * | 2004-04-28 | 2009-12-01 | Mark Resources, Inc. | Non-scanning radar for detecting and tracking targets |
-
2008
- 2008-05-29 ES ES08750784.4T patent/ES2468566T3/en active Active
- 2008-05-29 WO PCT/GB2008/050389 patent/WO2008146046A1/en active Application Filing
- 2008-05-29 US US12/159,432 patent/US7852261B2/en not_active Expired - Fee Related
- 2008-05-29 AU AU2008256573A patent/AU2008256573B2/en not_active Ceased
- 2008-05-29 EP EP08750784.4A patent/EP2153244B1/en not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5245347A (en) * | 1980-12-29 | 1993-09-14 | Raytheon Company | All weather tactical strike system (AWTSS) and method of operation |
Also Published As
Publication number | Publication date |
---|---|
EP2153244A1 (en) | 2010-02-17 |
WO2008146046A1 (en) | 2008-12-04 |
US7852261B2 (en) | 2010-12-14 |
EP2153244B1 (en) | 2014-04-30 |
AU2008256573A1 (en) | 2008-12-04 |
ES2468566T3 (en) | 2014-06-16 |
US20100225526A1 (en) | 2010-09-09 |
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Legal Events
Date | Code | Title | Description |
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FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |